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elongate. Wings with a supernumerary cell. There is qnly one 

 subapical cell in the tegmen (*). The ocelli are well-marked 

 and are on, or near, the apical margin of the vertex and are 

 visible dorsally. In the 3 genera known to me, the vertex is 

 obliquely striate, the pronotum finely granulate and the scutellum 

 very finely punctured. The female genital segments are of the 

 usual Tetigoniine type, but the male plates are very long and c)f 

 characteristic appearance; the valve is wanting. 



The structure of the head, of the venation and of the male 

 plates distinguish this group very thoroughly. Macroceratogonia 

 has some affinity with these forms, but only females are known 

 at present; the interior discoidal cell is also divided by a trans- 

 verse vein in both the specimens I have seen. It has also great 

 affinity with the Tetigoniini and Penthimiini, but must at present 

 be relegated to a provisional tribe by itself. 



Eight genera of lassini are known. 



1 \^ertex more than twice as long as wide, triangular pro- 



duced 3 Miiirella 



I'd Vertex not longer than wide {2} 



2 Fore femora and tibiae foliaccous 



8 Gabn'ta (=Pctalopo(ia )*'■■■ 



2a Femora simple (3) 



3 Pronotum keeled 7 Thagna 



3a Pronotum not keeled .• • (4 ' 



4 \^ertex expanded posteriorly behind the eyes ; ocelli near the 



apical margin of the vertex ; anterior and posterior mar- 

 gins of the pronotum subparallel 5 Tiiiohregnius 



4a Vertex not expanded behind the eyes (S) 



c; Ocelli near the eves ; anterior margin of pronotum rounded 



'.. (6) 



5a Ocelli remote from the eyes; anterior margin of pronotum 

 straight 6 NeocacUdia 



6 Scutellum much shorter tnan pronotum 4 P aliens 



6a Scutellum not shorter than pronotum (7) 



7 Anterior tibiae curved 3 Terulia 



7a Anterior tibiae straight (8) 



8 Frcns rather flat, distinctly sutured ; tempora wide but short ; 



antennae inserted near the intero-posterior angles of the 

 eyes I lassns 



* It is true there are two in Tliarm hthrita. but in the aniquo type of this the 

 exterior discoidal cell is divided apical of its middle by a short transverse vein, which 

 is absent in the other species of the genus. 



♦* There is nothing in the descriptions of these to keep them apart. 



